Ive noticed this sitting at a light. If Its in drive (A4 98 Z28), I can feel the car miss on 1 cylider. The engine will make a full firing order rotation and miss, then rotate again and when it hits whatever cylider its trying to fire on, it misses again.. I cant pinpoint where its misfiring. No check engine lights for misfire, just for Oxygen sensor.

Failing 02 sensors can cause misfires. If you have a code for it go get a scan to see how they are switching with the engine running at operating temp.

As far as the misfire...it can be a dozen things. Quick checks.....make sure none of the spark plug wires are touching any parts of the metal exhaust manifold piping. make sure they are all snapped on. If you know which cylinder is missing, swap wires with another cylinder to see if follows that wire. Then after that, you can do the same with that coil. Spark plug in that cylinder might be cracked. Might have a dirty fuel injector in that cylinder too. Or bad injector. Or bad wiring to that injector.

427ci stroker died at 173,000 miles...what a great engine that was, built by the late, great - Dave DiLuca...RIP...
-Life may not be the party we hoped for, but while we're here we might as well DANCE.

Sometimes a dirty fuel injector can be slightly dirty.....at idle the fuel has trouble atomizing. But under throttle the fuel pressure rises and can easily overcome that dirt. Until it gets really dirty.

Electrical problems do that also........something small causing an arc is more apparent at idle.....but again, under thottle, electrical output rises in the system and can overcome that small problem.

Its highly likely that one of the things I mentioned is your issue, but there's still other things that can cause misfires.

Try to find out which cylinder it is through a scan. Maybe even go get scanned for free at an auto parts store. It might show something.

427ci stroker died at 173,000 miles...what a great engine that was, built by the late, great - Dave DiLuca...RIP...
-Life may not be the party we hoped for, but while we're here we might as well DANCE.

427ci stroker died at 173,000 miles...what a great engine that was, built by the late, great - Dave DiLuca...RIP...
-Life may not be the party we hoped for, but while we're here we might as well DANCE.

mine is doing the same thing. i scanned it before and it showed cylinder 8. i replaced spark plugs and wires and i can still feel it but it doesnt show up on the scanner. ill report back if i figure it out.

mine is doing the same thing. i scanned it before and it showed cylinder 8. i replaced spark plugs and wires and i can still feel it but it doesnt show up on the scanner. ill report back if i figure it out.

Run a FULL can of SeaFoam through 1/8 - 1/4 tank of gas......that should clean out all the injectors pretty well.

Could be a coil issue too. Might want to swap it with another and scan again to see if that coil follws to the other cylinder.

427ci stroker died at 173,000 miles...what a great engine that was, built by the late, great - Dave DiLuca...RIP...
-Life may not be the party we hoped for, but while we're here we might as well DANCE.